Monday, September 17, 2007
Well we have discussed Dark Energy with regards to the underlying expansion of the Universe, but Dark Matter has recently come back on the radar with this new discovery of a Billion Light Year Void in the Universe in the region of Eridanus. This void is not only void of normal matter but also void of dark matter. The cold spots arise from the loss of energy as CMB photon counts as they pass through this reqion.
Posted by Raj Chanian at 9/17/2007 02:44:00 PM
Sunday, September 09, 2007
I have been comparing the limits of my favourite freeware astronomy software Cartes Du Ciel,
with the new astronomy add on for Google Earth,
and also with another online resource namely Data Release 6 of SDSS
which is approximately 16Tb of data.
And I am impressed with the results of my investigation which take me to the limit of 21 magnitude observational astronomy using these software.
So I decided to pick a special point in the sky to compare.
Start at Pisces directly below Pegasus Square and zoom due south.
Zoom past below Seyfert Galaxy NGC7742
Zoom past towards the Polygon asterism within Pisces denoted by stars
Zoom towards a Skewed Rhombus denoted by stars
TYCHO-2 2000 TYC 589-1671-1
USNO-A2.0 USNO-A2 0900-20488086
BSC 1991 HR 9004
at Visual Magnitude 5.30,
XZ8Q 32002(NE) aka
TYCHO-2 2000 TYC 590-329-1
USNO-A2.0 USNO-A2 0900-20511366
BSC 1991 HR 9033
at Visual Magnitude 5.59 and distance 1087.2 light years,
XZ Psc aka HD224062
at Visual Magnitude 5.78 and distance 652.3 light years,
XZ8Q 31958(SE) aka
TYCHO-2 2000 TYC 586-1293-1
USNO-A2.0 USNO-A2 0900-20500547
BSC 1991 HR 9022
at Visual Magnitude 5.77 and distance 271.8 light years
These group of 4 stars forming a skewed Rhombus point NE towards Pisces Polygon Western Side containing stars Iota and Lambda Piscium.
Zoom into the Rhombus and Zoom past a belt similar to Orion’s Belt denoted by stars
XZ8Q 32025 aka
TYCHO-2 2000 TYC 587-1273-1
USNO-A2.0 USNO-A2 0900-20516100
BSC 1991 HR 9042
at Visual Magnitude 6.29 and Distance 465.9 light years,
TYCHO-2 2000 TYC 587-949-1
USNO-A2.0 USNO-A2 0900-20507649
at Visual Magnitude 6.96 and Distance 652.3 light years,
XZ8Q 31950 aka
TYCHO-2 2000 TYC 586-272-1
USNO-A2.0 USNO-A2 0900-20497891
BSC 1991 HR 9015
at Visual Magnitude 6.47 and Distance 181.2 light years
Zoom downwards through the Rhombus toward a group of stars similar to Orion’s Sword denoted by stars
ASCC 1184742, ASCC 1184797 split by a galaxy NGC7783 aka Galaxy PGC72803 MCG 0-60- 58
pointing towards the lowest point of Rhombus denoted by star XZ8Q 32064
Zoom to the center of the triangulation of NGC7783, IC1515-17, IC5385
Zoom into this center until NGC7783, IC1515-17, IC5385 go out of view
Near this center find two Pleidaes type shining stars aligned on a diagonal denoted by stars
ASCC 1185089, ASCC 1263991
Zoom past these two Pleidaes type shining stars and let them travel south of you as you travel north of them towards a another group of two shining stars on a parallel denoted by stars
ASCC 1185088 aka V_USNOB 0899-0000043 aka E_USNOA U0825 00000615
ASCC 1263996 aka V_USNOB 0899-0627221
that sit between PGC 10 north and PGC 7 south
Zoom past these two shining stars on a parallel and let them travel south of you as you travel north of them and north of PGC 10
Zoom past PGC 10 and let it travel south of you as you travel north towards a another group of stars forming an Equilateral Triangle
This Equilateral Group of stars contains
E_USNOA U0825_00000501 Bottom Right
E_USNOA U0900_00000603 Vertex
E_USNOA U0825_00000738 Bottom Left=V_USNOB 0899-0000051
Zoom past these group of stars forming an Equilateral Triangle and let them travel west of you
ie let star E_USNOA U0825_00000738=V_USNOB 0899-0000051 travel to the west of you as you zoom in
ie and then let star E_USNOA U0825_00000501 travel to the west of you as you zoom in
Zoom past star V_USNOB 0900-0000004 and travel to the north west of you as you zoom in
Zoom until all stars are out of view both North, West, South, and East and stop just before you see the next stars namely
V_USNOB 0900-0618271 North East
V_USNOB 0900-0618263 North East
V_USNOB 0899-0627211 South East
You are now in a stellar void at magnitude 21
Where are you?
Posted by Raj Chanian at 9/09/2007 02:27:00 PM
Saturday, September 01, 2007
Well in December 2004 there were false rumours about an asteroid impact on the scale of the KT extinction 65 million years ago.
Data has now been refined, to ascertain the vicinity of the flyby and we are safe, so we say.
This is a great introductory link to Apophis for background reading on impact probabilities in 2036, and the
Torino Scale World Record
The purpose of this short post is to provide a portal of links to Near Earth Asteroid Projects and Web Resources.
SOLAR SYSTEM MAP
PLANETARY NEO LIST
PLANETARY NEO PROJECTS
Posted by Raj Chanian at 9/01/2007 06:11:00 AM